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464               SQUIRRELS   AND   GROUND   SQUIRRELS              CHAP.
postorbital processes. The infra-orbital foramen is, as a rule, not
large, but is increased in size in a few forms. The number of
separate pieces of bone in the sternum is five. The molars of the
upper jaw are five, but the first is very small and soon drops out.
The Squirrels are often rather brilliantly coloured. The
Chinese Sc. castaneiventris has grey fur with a rich chestnut-
coloured under surface. The Malabar Squirrel, Sc. mamimus, as
its name implies, a large animal, has a deep reddish or chestnut-
coloured fur above, which becomes yellow below. The " Common
Squirrel," " the lytill squerell full of besynesse," which is the
Squirrel of this country, is brownish red on the upper parts and
white below. It ranges from this country as far east as Japan.
Like many other Itodents the Squirrel likes animal food and will
eat both eggs and young birds. " Camel's hair" brushes are
made from this animal. The genus Tamias, almost exclusively
North American in range, is included by Dr. Forsyth Major1
in this genus, which then consists of considerably over one
hundred species.
The Ethiopian Ground Squirrels, genus Xerusy have a more
elongated skull than Sciurus, and the postorbital processes are
shorter. The feet are not hairy.
Nannosciurus forms a perfectly distinct genus of Squirrels.
These " Pygmy Squirrels" differ in possessing a very elongated
" face" and in the very broad frontal region. The teeth are
unlike those of Sciurus in certain features, and have been
especially compared by Forsyth Major to those of the Dormice.
Four species of this genus are Malayan ; one is West African.
The Bornean JKheitTirosciurus macro tis is the only species of
its genus. The genus may be distinguished by the exceedingly
brachyodont molars, this feature being more marked in this genus
than in all other Squirrels. It is called the " Groove-toothed
Squirrel," from the " seven to ten minute parallel vertical grooves
running down the front face of its incisors." 2
The genus Sperm&philus includes a large number (forty or so)"
of Palaearctic and Nearctic animals known as Sousliks. The ears
are small; there are cheek pouches as in Tamias. The general
aspect of the animal is like that of a Marmot, and they bridge over
the exceedingly narrow gap which separates the Marmots from
the true Squirrels. Anatomically the skull is like that of
1 Proc. Zool. Soc. 1893, p. 179.                     3 Flower and Ly